Modeling and Analysis of Rotor System Tolerance Based on Small Displacement Torsor

Abstract

Helicopter vibration is closely related to manufacturing technology.Reducing manufacturing error can effectively reduce helicopter vibration.In order to analyze the geometric rotation accuracy of helicopter rotor system, the key tolerance on the assembly path of parts is modeled based on small displacement torsor(SDT), and the error transfer on the closed-loop link is analyzed by homogeneous coordinate transformation method, and the geometric rotation accuracy model of rotor system is obtained.On this basis, combined with Monte Carlo simulation, an example model of rotor system is analyzed.The results show that the variation range of rotor blade root in space is approximately ellipsoidal, and there are complex fluctuations in the process of rotation.The radial fluctuation error of rotor blade root in the plane of rotor disk is about 0.58%, and the fluctuation in the direction perpendicular to the plane of rotor disk is relatively large, about 0.89%.

Keywords

• small displacement torsor
• tolerance modeling
• tolerance analysis
• error transfer
• random simulation